Just upgraded from the 3rd gen to this new Pro Edition and wow, there are some noticeable differences!

First off, yes - the installation is trickier than before. The manual clearly states professional installation is recommended. I'm pretty handy but decided to call an HVAC pro just to be safe. Cost me $120 extra but saved me potential headaches.

The temperature sensor is a game-changer! My bedroom would always be either too hot or cold compared to where the thermostat was located. Now it maintains perfect temps everywhere.

Energy savings seem legit too - my first month's bill dropped about 15% compared to my old Nest. The advanced calibration must be doing its job.

Only gripe? The polished silver finish shows fingerprints like crazy. Gotta wipe it down every few days if you want it looking pristine.

Overall though, if you're serious about home automation and energy efficiency, this pro version delivers where it counts!